In the vast area of heterocyclic chemistry, the search for new small polyfunctionalized heterocyclic rings constitutes a key step towards the synthesis of larger systems. Amongst these intermediate heterocycles, ortho amino esters are electrophilic and nucleophilic centre containing reagents that have been widely used for further cyclization reactions such as the annelation of a pyridine,[1] pyrimidine,[2] diazepine,[3] benzox-
